在linux系统下模拟一个supershell，通过 supershell指令执行linux终端的指令，并统计用户时间，内核时间，I/O缺页数和非I/O缺页数-Simulating linux shell and build a supershell with the command of supershell. Calculating the users time and elapse time,page faults,etc.

Try to spend as much time as possible in kernelspace to elapse ITIMER_PROF.